Secret Character ShanksIn Buggy's adventure mode, recruit Shanks and then win a battle using him

CrocodileTo unlock Crocodile as a playable captain in Adventure Mode, in Luffy's Adventure Mode, defeat Crocodile in Alubarna on the Alabasta Kingdom Sea Area Map, and after you defeat him, get the rank "Top Pirate on the Island". Before or after the credits, you will recieve Crocodile as a Playable Captain in Adventure Mode.

Secret Character EneruIn Crocodile's adventure mode, get Eneru as your ally in the Jaya area, and win a battle using him

BuggyTo unlock Buggy as a Captain in Adventure Mode, in Luffy's Adventure Mode, defeat Crocodile in Alubarna on the Alabasta Kingdom Sea Area, and recieve the rank "Top Pirate in Town", and before or after the credits, you will recieve Buggy as a Playable Captain in Adventure Mode.

Secret Character OhmIn Crocodile's adventure mode, get Ohm as your ally in the Jaya area, and win a battle using him

Secret Character Trace (Ace)In Buggy's adventure mode, recruit him in Drum Island, then win a battle using him

Secret Character Nico RobinIn Luffy's adventure mode, get her as your ally at the end, and win a battle using her

Secret Character Mr. 2 Bon ClayIn Crocodile's adventure mode, get Mr. 2 as your ally, and win a battle using him